January 27, 2011 - The roles of behavior culture in...

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2 differences in humans: adaptively flexible behavior & cultural knowledge 1. Extreme ability to shift foods based on abundance - Agriculture: self-reproducing resource --> abiotic resource This turns self-reproducing resources into "abiotic" (renewable but not self-reproducing) Reproducing is independent of population size Ability to control the growth of own resources - Ability to improve ability to extract resources and spread to others - How to culture and adaptive behavior change population dynamics (appendix 6) 2. Should carrying capacity, K grow with population size (N) or with the rate of population growth? dk / dt = cN Unlike logistic, the carrying capacity is not constant. Population growth is negative, meaning, more people than resources can support, the maximum population size will go down What happens if N > K? (Cohen uses P rather than N for population size) Cohen's "Condorcet" model (starts with logistic) - dN/dt = rN (K-N) - dK/dt = c (dN/dt) As population grows, the carrying capacity goes up - Population growth rate growing, things will change and more time to develop Human population is based on knowledge NOT resources Why did Cohen assume that the maximum population size (K) increased in proportion to population growth rate not population size?
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